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Interobserver agreement in the diagnosis of canine hip dysplasia using the standard ventrodorsal hip-extended radiographic method

Geert Verhoeven (UGent) , Frank Coopman (UGent) , Luc Duchateau (UGent) , Jimmy Saunders (UGent) , Bernadette Van Ryssen (UGent) and Henri van Bree (UGent)
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Abstract
OBJECTIVES: To determine the agreement between observers and to investigate the effect of observer experience in diagnosing canine hip dysplasia and providing final scoring of hips using the standard ventrodorsal hip-extended radiographic method. The agreement of the final scoring, with a presumed correct assessment based on the Norberg angle, is also investigated. METHODS: Thirty observers were requested to read 50 ventrodorsal hip-extended radiographs of 25 dogs according to Federation Cynologique International criteria. Groups of experienced (nine members) and inexperienced (21 members) observers were used. RESULTS: For providing the distinction between dysplastic versus non-dysplastic dogs, the average interobserver agreement was 72 per cent and was significantly higher (P < 0.0001) than the score that could be expected by chance without any agreement between observers. For providing the final score (A, B, C, D or E), an average interobserver agreement of 43(.)6 per cent was found. In the experienced group, an agreement score of 76 per cent was found for the distinction between AB versus non-AB and an agreement score of 81 per cent was found for the distinction between C versus non-C. The agreement score was significantly higher (P < 0.0001) for the experienced group than for the inexperienced group in all cases. Agreement between the presumed correct assessment based on the Norberg angle and the observer's evaluation was low (P=0(.)35), irrespective of whether the observers were experienced (71(.)8 per cent correct assessments) or inexperienced (69 per cent correct assessments). CLINICAL SIGNIFICANCE: Although interobserver agreement is low, observer experience increases agreement.
Keywords
DOGS, DEGENERATIVE JOINT DISEASE, BREEDS, NORBERG ANGLE

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Chicago
Verhoeven, Geert, Frank Coopman, Luc Duchateau, Jimmy Saunders, Bernadette Van Ryssen, and Henri van Bree. 2007. “Interobserver Agreement in the Diagnosis of Canine Hip Dysplasia Using the Standard Ventrodorsal Hip-extended Radiographic Method.” Journal of Small Animal Practice 48 (7): 387–393.
APA
Verhoeven, Geert, Coopman, F., Duchateau, L., Saunders, J., Van Ryssen, B., & van Bree, H. (2007). Interobserver agreement in the diagnosis of canine hip dysplasia using the standard ventrodorsal hip-extended radiographic method. JOURNAL OF SMALL ANIMAL PRACTICE, 48(7), 387–393.
Vancouver
1.
Verhoeven G, Coopman F, Duchateau L, Saunders J, Van Ryssen B, van Bree H. Interobserver agreement in the diagnosis of canine hip dysplasia using the standard ventrodorsal hip-extended radiographic method. JOURNAL OF SMALL ANIMAL PRACTICE. 2007;48(7):387–93.
MLA
Verhoeven, Geert, Frank Coopman, Luc Duchateau, et al. “Interobserver Agreement in the Diagnosis of Canine Hip Dysplasia Using the Standard Ventrodorsal Hip-extended Radiographic Method.” JOURNAL OF SMALL ANIMAL PRACTICE 48.7 (2007): 387–393. Print.
@article{397301,
  abstract     = {OBJECTIVES: To determine the agreement between observers and to investigate the effect of observer experience in diagnosing canine hip dysplasia and providing final scoring of hips using the standard ventrodorsal hip-extended radiographic method. The agreement of the final scoring, with a presumed correct assessment based on the Norberg angle, is also investigated. 
METHODS: Thirty observers were requested to read 50 ventrodorsal hip-extended radiographs of 25 dogs according to Federation Cynologique International criteria. Groups of experienced (nine members) and inexperienced (21 members) observers were used. 
RESULTS: For providing the distinction between dysplastic versus non-dysplastic dogs, the average interobserver agreement was 72 per cent and was significantly higher (P {\textlangle} 0.0001) than the score that could be expected by chance without any agreement between observers. For providing the final score (A, B, C, D or E), an average interobserver agreement of 43(.)6 per cent was found. In the experienced group, an agreement score of 76 per cent was found for the distinction between AB versus non-AB and an agreement score of 81 per cent was found for the distinction between C versus non-C. The agreement score was significantly higher (P {\textlangle} 0.0001) for the experienced group than for the inexperienced group in all cases. Agreement between the presumed correct assessment based on the Norberg angle and the observer's evaluation was low (P=0(.)35), irrespective of whether the observers were experienced (71(.)8 per cent correct assessments) or inexperienced (69 per cent correct assessments). 
CLINICAL SIGNIFICANCE: Although interobserver agreement is low, observer experience increases agreement.},
  author       = {Verhoeven, Geert and Coopman, Frank and Duchateau, Luc and Saunders, Jimmy and Van Ryssen, Bernadette and van Bree, Henri},
  issn         = {0022-4510},
  journal      = {JOURNAL OF SMALL ANIMAL PRACTICE},
  language     = {eng},
  number       = {7},
  pages        = {387--393},
  title        = {Interobserver agreement in the diagnosis of canine hip dysplasia using the standard ventrodorsal hip-extended radiographic method},
  url          = {http://dx.doi.org/10.1111/j.1748-5827.2007.00364.x},
  volume       = {48},
  year         = {2007},
}

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